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// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
*/
#include "intel_memory_region.h"
#include "i915_gem_region.h"
#include "i915_drv.h"
#include "i915_trace.h"
void
i915_gem_object_put_pages_buddy(struct drm_i915_gem_object *obj,
struct sg_table *pages)
{
__intel_memory_region_put_pages_buddy(obj->mm.region, &obj->mm.blocks);
obj->mm.dirty = false;
sg_free_table(pages);
kfree(pages);
}
int
i915_gem_object_get_pages_buddy(struct drm_i915_gem_object *obj)
{
struct intel_memory_region *mem = obj->mm.region;
struct list_head *blocks = &obj->mm.blocks;
resource_size_t size = obj->base.size;
resource_size_t prev_end;
struct i915_buddy_block *block;
unsigned int flags;
struct sg_table *st;
struct scatterlist *sg;
unsigned int sg_page_sizes;
int ret;
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st)
return -ENOMEM;
if (sg_alloc_table(st, size >> ilog2(mem->mm.chunk_size), GFP_KERNEL)) {
kfree(st);
return -ENOMEM;
}
flags = I915_ALLOC_MIN_PAGE_SIZE;
if (obj->flags & I915_BO_ALLOC_CONTIGUOUS)
flags |= I915_ALLOC_CONTIGUOUS;
ret = __intel_memory_region_get_pages_buddy(mem, size, flags, blocks);
if (ret)
goto err_free_sg;
GEM_BUG_ON(list_empty(blocks));
sg = st->sgl;
st->nents = 0;
sg_page_sizes = 0;
prev_end = (resource_size_t)-1;
list_for_each_entry(block, blocks, link) {
u64 block_size, offset;
block_size = min_t(u64, size,
i915_buddy_block_size(&mem->mm, block));
offset = i915_buddy_block_offset(block);
GEM_BUG_ON(overflows_type(block_size, sg->length));
if (offset != prev_end ||
add_overflows_t(typeof(sg->length), sg->length, block_size)) {
if (st->nents) {
sg_page_sizes |= sg->length;
sg = __sg_next(sg);
}
sg_dma_address(sg) = mem->region.start + offset;
sg_dma_len(sg) = block_size;
sg->length = block_size;
st->nents++;
} else {
sg->length += block_size;
sg_dma_len(sg) += block_size;
}
prev_end = offset + block_size;
}
sg_page_sizes |= sg->length;
sg_mark_end(sg);
i915_sg_trim(st);
__i915_gem_object_set_pages(obj, st, sg_page_sizes);
return 0;
err_free_sg:
sg_free_table(st);
kfree(st);
return ret;
}
void i915_gem_object_init_memory_region(struct drm_i915_gem_object *obj,
struct intel_memory_region *mem,
unsigned long flags)
{
INIT_LIST_HEAD(&obj->mm.blocks);
obj->mm.region = intel_memory_region_get(mem);
obj->flags |= flags;
if (obj->base.size <= mem->min_page_size)
obj->flags |= I915_BO_ALLOC_CONTIGUOUS;
mutex_lock(&mem->objects.lock);
if (obj->flags & I915_BO_ALLOC_VOLATILE)
list_add(&obj->mm.region_link, &mem->objects.purgeable);
else
list_add(&obj->mm.region_link, &mem->objects.list);
mutex_unlock(&mem->objects.lock);
}
void i915_gem_object_release_memory_region(struct drm_i915_gem_object *obj)
{
struct intel_memory_region *mem = obj->mm.region;
mutex_lock(&mem->objects.lock);
list_del(&obj->mm.region_link);
mutex_unlock(&mem->objects.lock);
intel_memory_region_put(mem);
}
struct drm_i915_gem_object *
i915_gem_object_create_region(struct intel_memory_region *mem,
resource_size_t size,
unsigned int flags)
{
struct drm_i915_gem_object *obj;
/*
* NB: Our use of resource_size_t for the size stems from using struct
* resource for the mem->region. We might need to revisit this in the
* future.
*/
GEM_BUG_ON(flags & ~I915_BO_ALLOC_FLAGS);
if (!mem)
return ERR_PTR(-ENODEV);
size = round_up(size, mem->min_page_size);
GEM_BUG_ON(!size);
GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_MIN_ALIGNMENT));
/*
* XXX: There is a prevalence of the assumption that we fit the
* object's page count inside a 32bit _signed_ variable. Let's document
* this and catch if we ever need to fix it. In the meantime, if you do
* spot such a local variable, please consider fixing!
*/
if (size >> PAGE_SHIFT > INT_MAX)
return ERR_PTR(-E2BIG);
if (overflows_type(size, obj->base.size))
return ERR_PTR(-E2BIG);
obj = mem->ops->create_object(mem, size, flags);
if (!IS_ERR(obj))
trace_i915_gem_object_create(obj);
return obj;
}
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